Remove support for the GPL incompatible FTDI D2XX library
[openocd.git] / tcl / mem_helper.tcl
1 # Helper for common memory read/modify/write procedures
2
3 # mrw: "memory read word", returns value of $reg
4 proc mrw {reg} {
5 set value ""
6 mem2array value 32 $reg 1
7 return $value(0)
8 }
9
10 add_usage_text mrw "address"
11 add_help_text mrw "Returns value of word in memory."
12
13 proc mrb {reg} {
14 set value ""
15 mem2array value 8 $reg 1
16 return $value(0)
17 }
18
19 add_usage_text mrb "address"
20 add_help_text mrb "Returns value of byte in memory."
21
22 # mmw: "memory modify word", updates value of $reg
23 # $reg <== ((value & ~$clearbits) | $setbits)
24 proc mmw {reg setbits clearbits} {
25 set old [mrw $reg]
26 set new [expr ($old & ~$clearbits) | $setbits]
27 mww $reg $new
28 }
29
30 add_usage_text mmw "address setbits clearbits"
31 add_help_text mmw "Modify word in memory. new_val = (old_val & ~clearbits) | setbits;"